Hi all,
I kindly seek some assistance on solving this issue, I bought a Creative Gigaworks G500 dirt cheap, only the sub (without the control pod) in the intention of hooking it up to my Sony receiver.
Without the control pod its not possible to turn on the preamp board or the unit properly, however it was jumped from inside to accommodate the sub input at max volume, bypassing other circuitry.
While Amp works fine there is a DC offset of 2.5 -2.9 v on the input line,hence i'm not comfortable in hooking it to the receiver because it might damage it.
It is normal to have such high dc value or can anything be done? or any suggestion to wire the input line..
Its a TDA class D bridge design I believe, currently it was wired like in the pictures. Pre-amp(MS0730B) board connects to the power amp(MS0730A)via j1 and j4.
currently wired at sub1+ and sub+2 points, is this the correct way to wire the input, or can anyone suggest a way to turn this unit on properly?😕
Any help greatly appreciated..
I kindly seek some assistance on solving this issue, I bought a Creative Gigaworks G500 dirt cheap, only the sub (without the control pod) in the intention of hooking it up to my Sony receiver.
Without the control pod its not possible to turn on the preamp board or the unit properly, however it was jumped from inside to accommodate the sub input at max volume, bypassing other circuitry.
While Amp works fine there is a DC offset of 2.5 -2.9 v on the input line,hence i'm not comfortable in hooking it to the receiver because it might damage it.
It is normal to have such high dc value or can anything be done? or any suggestion to wire the input line..
Its a TDA class D bridge design I believe, currently it was wired like in the pictures. Pre-amp(MS0730B) board connects to the power amp(MS0730A)via j1 and j4.
currently wired at sub1+ and sub+2 points, is this the correct way to wire the input, or can anyone suggest a way to turn this unit on properly?😕
Any help greatly appreciated..
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Dear mods, can you please move this thread to the correct section if I have posted in in a wrong section. Im new to diya, its my first post.
Thanks in advance.
Cheers
// nkirk
Thanks in advance.
Cheers
// nkirk
We'll put it in analogue line level 🙂
As ever with anything like this, without a circuit showing how its all configured, then its all guesswork.
DC voltage at an input isn't normal but on the other hand if that "input" is a point on the circuit that is somewhere other than the correct or normal user inputs then anything is possible. If some sections of the circuit aren't powered up then again, that could cause odd things to happen.
As ever with anything like this, without a circuit showing how its all configured, then its all guesswork.
DC voltage at an input isn't normal but on the other hand if that "input" is a point on the circuit that is somewhere other than the correct or normal user inputs then anything is possible. If some sections of the circuit aren't powered up then again, that could cause odd things to happen.
Anyone with experience with creative g500 schematics, or can anyone suggest a way to sink the DC voltage to a minimum? I only intend to use this as a Sub woofer input, hence Im ok with high frequency roll over eg 300 hz and above.
any help is much appreciated.
//nkirk
any help is much appreciated.
//nkirk
have you studied the output schematic where you measured that high output offset.
It is usual to have a DC blocking capacitor on the output of Source equipment.
It is also common but not usual to have a grounding resistor after that capacitor to take capacitor leakage to signal ground.
One or both of these components may be missing.
The input to most equipment also have these two components. resistor to ground before the DC blocking capacitor, at the input of receiving equipment.
The system interconnection does NOT NEED both Dc blocking capacitors. One is sufficient on each channel. It can be at either the output of the Source OR at the input of the Receiver. It does no damage to have both. But it confuses the LF signal that tries to get out/in. The electrons were told by the designer how to pass one DC blocker and when they reach a second one the rules they were given break down. A bit like the donkey in the cabbage patch, do we go, or do we not?
It is usual to have a DC blocking capacitor on the output of Source equipment.
It is also common but not usual to have a grounding resistor after that capacitor to take capacitor leakage to signal ground.
One or both of these components may be missing.
The input to most equipment also have these two components. resistor to ground before the DC blocking capacitor, at the input of receiving equipment.
The system interconnection does NOT NEED both Dc blocking capacitors. One is sufficient on each channel. It can be at either the output of the Source OR at the input of the Receiver. It does no damage to have both. But it confuses the LF signal that tries to get out/in. The electrons were told by the designer how to pass one DC blocker and when they reach a second one the rules they were given break down. A bit like the donkey in the cabbage patch, do we go, or do we not?
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